EP3686949B1 - Secondary battery and battery module - Google Patents
Secondary battery and battery module Download PDFInfo
- Publication number
- EP3686949B1 EP3686949B1 EP19184413.3A EP19184413A EP3686949B1 EP 3686949 B1 EP3686949 B1 EP 3686949B1 EP 19184413 A EP19184413 A EP 19184413A EP 3686949 B1 EP3686949 B1 EP 3686949B1
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- EP
- European Patent Office
- Prior art keywords
- tab
- current collecting
- electrode
- axial direction
- secondary battery
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 238000000429 assembly Methods 0.000 claims description 47
- 230000000712 assembly Effects 0.000 claims description 47
- 208000029154 Narrow face Diseases 0.000 claims description 14
- 230000008595 infiltration Effects 0.000 description 16
- 238000001764 infiltration Methods 0.000 description 16
- 239000003792 electrolyte Substances 0.000 description 13
- 238000003466 welding Methods 0.000 description 11
- 239000011248 coating agent Substances 0.000 description 7
- 238000000576 coating method Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 7
- 230000007704 transition Effects 0.000 description 6
- 239000011149 active material Substances 0.000 description 4
- 238000005452 bending Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 239000012943 hotmelt Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000007773 negative electrode material Substances 0.000 description 1
- 239000007774 positive electrode material Substances 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
Images
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/04—Construction or manufacture in general
- H01M10/0431—Cells with wound or folded electrodes
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
- H01M10/0585—Construction or manufacture of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/04—Construction or manufacture in general
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
- H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
- H01M50/103—Primary casings; Jackets or wrappings characterised by their shape or physical structure prismatic or rectangular
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/147—Lids or covers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/147—Lids or covers
- H01M50/148—Lids or covers characterised by their shape
- H01M50/15—Lids or covers characterised by their shape for prismatic or rectangular cells
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
- H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
- H01M50/207—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape
- H01M50/209—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape adapted for prismatic or rectangular cells
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
- H01M50/249—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders specially adapted for aircraft or vehicles, e.g. cars or trains
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
- H01M50/507—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing comprising an arrangement of two or more busbars within a container structure, e.g. busbar modules
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
- H01M50/533—Electrode connections inside a battery casing characterised by the shape of the leads or tabs
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
- H01M50/536—Electrode connections inside a battery casing characterised by the method of fixing the leads to the electrodes, e.g. by welding
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
- H01M50/538—Connection of several leads or tabs of wound or folded electrode stacks
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
- H01M50/54—Connection of several leads or tabs of plate-like electrode stacks, e.g. electrode pole straps or bridges
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Definitions
- the disclosure relates to the technical field of battery, and in particular, to a secondary battery and a battery module.
- the electrode assembly included in the secondary battery has an end face and a full tab extending from the end face. Since the dimension of the full tab is equal to the dimension of the end face and the electrolyte mainly infiltrates through the gap in the end face, it is difficult for the electrolyte to infiltrate the entire electrode assembly quickly and uniformly in the electrolyte infiltration step, which causes poor infiltration effect and low infiltration efficiency.
- a secondary battery including: a case; a cap plate covering an opening of the case; a first electrode assembly and a second electrode assembly inside the case; a current collecting member including a first current collecting piece electrically connected to an electrode of the first electrode assembly; and a second current collecting piece electrically connected to an electrode of the second electrode assembly; a first terminal electrically connected to the first current collecting member and protruding outside the case.
- a secondary battery including: a case; a cap plate at an opening of the case and defining terminal openings; a pair of electrode assemblies, each including a first electrode including a tab, a second electrode including a tab, and a separator between the first electrode and the second electrode; and first and second electrode terminals respectively connected to the tabs of the first and second electrodes and respectively passing through the terminal openings.
- the document JP 2007073317 A discloses a winding power generation element including a positive electrode plate, a negative electrode plate and two separators which are laminated and wound with one another; the negative electrode plate and the positive electrode plate are shifted to each other in a direction of the separator width and are wound in a flat shape while being laminated.
- the present invention relates to a secondary battery and a battery module, and is defined by the features of claim 1.
- the secondary battery includes an electrode assembly having an end face and a tab having a dimension smaller than that of the end face, and the electrolyte can be immersed into the interior of the electrode assembly more quickly and uniformly through the end face, thereby making the electrode assembly have high infiltration efficiency and good infiltration effect.
- an embodiment of the disclosure provide a secondary battery comprising a casing, which includes a receiving hole having an opening; a top cover assembly, which includes a top cover plate connected to the casing to close the opening; an electrode assembly, which is disposed within the receiving hole, the electrode assembly includes two end faces which are opposed to each other in a first direction perpendicular to an axial direction of the receiving hole and tabs extending from the end faces, the electrode assembly includes two or more electrode units which are laminated in the axial direction, and in a second direction perpendicular to the axial direction and the first direction, a dimension of the tab is smaller than a dimension of the end face; and a current collecting member, which is electrically connected to the tab; the electrode unit has two wide faces and two narrow faces connecting the two wide faces, an area of each of the two wide faces is larger than an area of each of the two narrow faces, the two wide faces are disposed to be opposite to each other in the axial direction, and the wide faces and the narrow faces are alternately disposed.
- the current collecting member includes a connecting portion disposed between the end face and the casing, the connecting portion has a first sheet extending along the axial direction and a current collecting piece through which the tab is electrically connected to the first sheet, the current collecting piece and the tab are folded with respect to the first direction such that the tab is connected to a surface of the current collecting piece facing away from the end face.
- the end face includes a first region, a second region, and a third region that are distributed along the second direction, the tab only extents out of the first region, and the second region and the third region are respectively located on both sides of the first region.
- a dimension of the third region is smaller than a dimension of the second region.
- a ratio of a dimension of the tab to a dimension of the end face is 1/15 to 14/15.
- the electrode assembly includes two electrode units, each of the two electrode units has two sub-end faces and a sub-tab extending from each of the two sub-end faces, two of the sub-end faces on the same side of two electrode units of the electrode assembly form the end face, and two of the sub-tabs of two electrode units of the electrode assembly having same electrode are converged to form the tab, and in the electrode assembly, the sub-tab of one of the two electrode units extends along the axial direction from the region of the sub-end face adjacent to the other of the two electrode units.
- the tab extends from the region of the end face adjacent to the two adjacent wide faces of the two electrode units.
- the connecting portion and the tab are at least partially overlapped in the axial direction.
- the current collecting member further includes a body portion that is connected to the connecting portion, and the body portion is at least partially disposed between the electrode assembly and the top cover assembly.
- the first sheet has a stripe structure and the thickness direction of the first sheet is parallel to the first direction.
- a connection structure is formed by the first sheet and the tab, and the connection structure does not protrude out of an edge of the top cover plate in the first direction.
- the tab and the current collecting piece are both located on one side of the first sheet in the second direction, and the current collecting piece and the tab are at least partially overlapped in the axial direction.
- the number of the electrode assemblies is two groups, and the two groups of the electrode assemblies are laminated in the axial direction; the number of the current collecting pieces is two, and the two current collecting pieces are spaced apart in the axial direction and the two current collecting pieces are at least partially overlapped in the axial direction; the tab of one group of the electrode assemblies and the tab of the other group of the electrode assemblies are respectively connected to the two current collecting pieces, and the tab of the one group of the electrode assemblies and the tab of the other group of the electrode assemblies at least partially overlap in the axial direction.
- the first sheet and the tab are at least partially overlapped in the axial direction.
- the number of the electrode assemblies is two groups, and the two groups of the electrode assemblies are laminated in the axial direction; the number of the first sheets and the number of the current collecting pieces each is two, the first sheets are disposed in one-to-one correspondence with the current collecting pieces, the two first sheets are spaced apart in the second direction, and the two current collecting pieces are spaced apart in the axial direction and are spaced apart in the second direction; the tab of one group of the electrode assemblies and the tab of the other group of the electrode assemblies are spaced apart in the axial direction and are spaced apart in the second direction, and the two tabs are respectively connected to the two current collecting pieces.
- the number of the current collecting members is two, and in the first direction, the electrode assembly is disposed between the two current collecting members, and the two current collecting members are electrically connected to the corresponding tabs.
- the secondary battery according to the embodiment of the disclosure includes a casing, an electrode assembly disposed within the casing, a top cover assembly connected to the casing, and a current collecting member electrically connected to the electrode assembly.
- the electrode assembly has end faces and tabs extending from the end faces.
- the tab of the electrode assembly is electrically connected to the current collecting member. Since the dimension of the tab according to the present embodiment is smaller than the dimension of the end face, the tab cannot completely cover the end face, so that the electrolyte can be immersed into the interior of the electrode assembly more quickly and uniformly through the region of the end face that is not covered by the tab. Thus, it is advantageous to improve the infiltration efficiency and the infiltration effect of the electrode assembly in the electrolyte infiltration step.
- a battery module including two or more secondary batteries mentioned in the above embodiments, wherein the two or more secondary batteries are arranged side by side in a direction intersecting with the axial direction.
- an embodiment of the disclosure provides a battery module 10, which includes two or more secondary batteries 20 according to the present embodiment and a busbar 101 for connecting two secondary batteries 20.
- the two or more secondary batteries 20 are arranged side by side in the same direction.
- One end of the busbar 101 is fixedly connected to one of the two secondary batteries 20, and the other end thereof is connected fixedly to the other of the secondary batteries 20.
- the secondary battery 20 includes a casing 21, an electrode assembly 23 disposed within the casing 21, and a top cover assembly 22 sealingly connected to the casing 21.
- the casing 21 may have a quadrangular shape or other shape.
- the casing 21 includes a receiving hole 21a having an opening.
- the receiving hole 21a is used for receiving the electrode assembly 23 and the electrolyte.
- the casing 21 may be made of a material such as aluminum, aluminum alloy, or plastic.
- the electrode assembly 23 includes two end faces 23a which are opposed to each other in a first direction Y perpendicular to an axial direction X of the receiving hole 21a and tabs 23b extending from the end faces 23a, wherein the axial direction X of the receiving hole 21a is the same as the direction along which the receiving hole 21a extends.
- one tab 23b extends from each end face 23a of the electrode assembly 23.
- the electrode assembly 23 has two tabs 23b which are opposed to each other in the first direction Y, one of which serves as the positive tab and the other of which serves as the negative tab.
- the electrode assembly 23 according to the present embodiment has a dimension of 0.01 mm to 1000 mm in the axial direction X. Therefore, it is possible to ensure that the fitting dimension of the electrode assembly 23 according to the present embodiment can be flexibly selected according to the use requirements of the product.
- the electrode assembly 23 includes two or more electrode units 231 which are laminated in the axial direction X of the receiving hole 21a.
- the electrode unit 231 has sub-end faces 231a and sub-tabs 231b extending from the sub-end faces 231a.
- the body and the sub-tabs 231b connected to the body of the electrode unit 231 according to the present embodiment may be formed by stacking or winding a first electrode plate, a second electrode plate, and a separator together.
- the separator is an insulator between the first electrode plate and the second electrode plate.
- the electrode unit 231 includes a layer of the separator, a layer of the first electrode plate, and a layer of the second electrode plate which are wound together.
- the first electrode plate is exemplified as a positive electrode plate
- the second electrode plate is a negative electrode plate.
- the first electrode plate may also be a negative electrode plate
- the second electrode plate is a positive electrode plate.
- the positive-electrode active material is coated onto the coating region of the positive electrode plate
- the negative-electrode active material is coated onto the coating region of the negative electrode plate.
- a plurality of uncoated regions extending from the body serve as the sub-tabs 231b.
- Each electrode unit 231 includes two sub-tabs 231b, i.e., a positive tab and a negative tab, which are opposite to each other in the first direction Y.
- the first direction Y is perpendicular to the axial direction X.
- the end face 23a of one electrode assembly 23 includes the sub-end faces 231a of the respective electrode units 231, that is, the sub-end faces 231a on the same sides of all the respective electrode units 231 collectively form the end face 23a.
- the tab 23b of one electrode assembly 23 includes the sub-tabs 231b of the respective electrode units 231, that is, the tabs 231b having same electrode of all the respective electrode units 231 collectively converge to form the tab 23b. In one embodiment, as shown in Fig.
- the electrode unit 231 has a flat structure having two wide faces 231c and two narrow faces 231d connecting the two wide faces 231c.
- the area of the wide face 231c is larger than the area of the narrow face 231d.
- the two wide faces 231c are disposed to be opposite to each other in the axial direction X.
- the wide faces 231c of the electrode unit 231 face the top cover assembly 22.
- the wide faces 231c and the narrow faces 231d of the electrode unit 231 are alternately disposed.
- the positive sub-tab 231b extends from the coating region of the positive electrode plate, and the negative sub-tab 231b extends from the coating region of the negative electrode plate.
- the active material layer included in the electrode unit 231 according to the present embodiment may expand, which causes the electrode unit 231 as a whole to expand.
- the electrode unit 231 of the embodiment has a capacity of 5Ah to 500 Ah.
- the electrode assembly 23 includes two electrode units 231.
- Each of the two electrode unit 231 has sub-end faces 231a and sub-tabs 231b extending from the sub-end faces 231a.
- the two sub-end faces 231a on the same side form one end face 23a of the electrode assembly 23.
- the two sub-tabs 231b having same electrode converge to form the tab 23b of the electrode assembly 23.
- the sub-tab 231b of one electrode unit 231 extends in the axial direction X from the region of the sub-end face 231a adjacent to the other electrode unit 231, so that the respective sub-tabs 231b of the two electrode units 231 are close to each other and extend a short distance to converge into the tab 23b fixedly connected to the current collecting member 24.
- the sub-tab 231b does not suffer from length redundancy (such redundancy causes the sub-tab 231b be easily inserted inside the electrode assembly 23 when bent to result in short-circuit); on the other hand, the extending dimension of the sub-tab 231b is controlled within a small range, which is advantageous to improve the overall compactness of the tab 23b formed by the convergence of the respective sub-tabs 231b, to reduce the overall space occupancy of the tab 23b, and to improve the energy density of the secondary battery 20.
- the two or more electrode units 231 are laminated within the casing 21 in the axial direction X.
- the electrode assembly 23 When the electrode units 231 expand, the electrode assembly 23 generates a first expansion force along a second direction Z perpendicular to both the axial direction X and the first direction Y and a second expansion force along the axial direction X. Since the two or more electrode unit 231 are laminated and the area of the wide face 231c is larger than the area of the narrow face 231d, the first expansion force is smaller than the second expansion force. Therefore, expansion of the electrode assembly 23 mainly occurs along the axial direction X, so that the expansion force of the electrode assembly 23 is mainly in the axial direction X, while the first expansion force along the second direction Z is relatively small.
- the casing 21 may not substantially deformed due to the small first expansion force.
- the two or more secondary batteries 20 according to the present embodiment are arranged side by side in the second direction Z to form the battery module 10, since the second expansion force generated when each secondary battery 20 expands intersects with the second direction Z, that is, since the direction of the second expansion force generated by expansion of each secondary battery 20 is in the axial direction X, the second expansion force generated by each secondary battery 20 does not accumulate to form a large resultant force along the second direction Z.
- the requirements for rigidity and strength of the fixing member is low, which is advantageous to reduce the volume or weight of the fixing member, further to improve the energy density and space utilization of the secondary battery 20 and the overall battery module 10, and further to improve the cycle performance of the secondary battery 20.
- the dimension L of the tab 23b is smaller than the dimension D of the end face 23a, that is, in the second direction Z, the tab 23b according to the present embodiment is narrower than the end face 23a, so that the tab 23b according to the present embodiment is a die-cut tab. Since the tab 23b according to the present embodiment is narrower than the end face 23a, the area of the end face 23a covered by the tab 23b is reduced while the area where the end face 23a is exposed to the outside is larger, so that the electrolyte can enter into the electrode unit 231 from the portion of the end face 23a other than the portion covered by the tab 23b in the electrolyte infiltration step.
- the electrolyte can enter more quickly and uniformly into the gap between the positive electrode plate with the coating region and the separator or the gap between the negative electrode plate with the coating region and the separator, which is advantageous to improve infiltration efficiency and infiltration effect.
- the ratio of the dimension L of the tab 23b to the dimension D of the end face 23a is 1/15 to 14/15.
- the ratio of the dimension L of the tab 23b to the dimension D of the end face 23a is less than 1/15, the overcurrent capability of the tab 23b is weak.
- the ratio of the dimension L of the tab 23b to the dimension D of the end face 23a is larger than 14/15, the infiltration efficiency is low and the infiltration effect is poor.
- the top cover assembly 22 is sealingly connected to the casing 21 to close the opening.
- the top cover assembly 22 includes a top cover plate 221 and electrode terminals 222.
- the top cover assembly 22 is sealingly connected to the casing 21 by the top cover plate 221.
- the top cover plate 221 and the electrode terminals are located on one side of the electrode assembly 23 in the axial direction X.
- the electrode terminals 222 are disposed on the top cover plate 221 and are electrically connected to the electrode assembly 23 through the current collecting members 24. According to this embodiment, the electrode terminal 222 and the current collecting member 24 are connected by welding.
- the both melt and mix with each other, so that after the welding is completed, the both are structurally embedded with each other to improve the connection strength of the both, and the electrode terminal 222 and the current collecting member 24 are less likely to be separated from each other when the secondary battery 20 is subjected to external vibration, and therefore, the use safety and stability of the secondary battery 20 are improved.
- the electrode terminal 222 and the current collecting member 24 according to the present embodiment are welded to form a welded portion 99.
- the electrode terminal 222 and the current collecting member 24 according to the present embodiment may be connected by means of hot-melt welding.
- the end face 23a in the second direction Z, includes a first region 230a, a second region 230b, and a third region 230c.
- the tab 23b extends only from the first region 230a.
- the second region 230b is located on one side of the first region 230a
- the third region 230c is located on the other side of the first region 230a, that is, the third region 230c and the second region 230b are respectively located on both sides of the first region 230a, so that the tab 23b according to the present embodiment extending from the first region 230a is formed as a die-cut tab.
- the tab 23b has a substantially rectangular or substantially trapezoidal cross section.
- the dimension of the third region 230c is smaller than the dimension of the second region 230b such that the tab 23b according to the present embodiment is closer to the other narrow face 231d than one narrow face 231d.
- the number of electrode assemblies 23 is two.
- the two electrode assemblies 23 are laminated in the axial direction X.
- the first regions 230a, the second regions 230b, and the third regions 230c of the two electrode assemblies 23 are substantially aligned in the axial direction X, respectively, such that the two tabs 23b having same electrode are also substantially aligned in the axial direction X.
- the number of electrode assemblies 23 is two.
- the two electrode assemblies 23 are laminated in the axial direction X.
- One of the two electrode assemblies 23 is disposed to be rotated 180° with respect to the other of the two electrode assemblies 23 such that the first regions 230a, the second regions 230b, and third regions 230c of the two electrode assemblies 23 do not correspond in the axial direction X, respectively.
- the two tabs 23b having same electrode of the two electrode assemblies 23 differ in position, and the two tabs 23b having same electrode do not overlap in the axial direction X.
- the current collecting member 24 includes a connecting portion 241 located between the end face 23a and the casing 21 and a body portion 242 connected to the connecting portion 241.
- the connecting portion 241 and the tab 23b are at least partially overlapped in the axial direction X, thereby reducing the space occupancy of the connecting portion 241 and the tab 23b in the first direction Y, which is advantageous to improve the energy density of the secondary battery 20.
- the body portion 242 is at least partially located between the electrode assembly 23 and the top cover assembly 22. In one embodiment, a portion of the body portion 242 located between the electrode assembly 23 and the top cover assembly 22 is welded to the electrode terminal 222.
- the body portion 242 includes a sheet-like body that is connected to the connecting portion 241 and bosses that protrude from the sheet-like body.
- the thickness direction of the sheet-like body is parallel to the axial direction X.
- the bosses protrude toward the electrode terminal 222 along the axial direction.
- the body portion 242 is welded to the electrode terminal 222 by the bosses.
- the top cover plate 221 is provided with an electrode lead-out hole, and the boss extends at least partially into the electrode lead-out hole to be welded to the electrode terminal 222, thereby reducing the space occupancy of the body portion 242 in the axial direction X, which is advantageous to improve the energy density of the secondary battery 20.
- the connecting portion 241 has a first sheet 241a extending along the axial direction X.
- the tab 23b is electrically connected to the first sheet 241a.
- the first sheet 241a has a stripe structure and the thickness direction of the first sheet 241a is parallel to the first direction Y, thereby reducing the dimension of the first sheet 241a in the first direction Y, which is advantageous to reduce the space occupancy of the first sheet 241a in the first direction Y and to improve the energy density of the secondary battery 20.
- the first sheet 241a has a rectangular structure.
- the connecting portion 241 further has a current collecting piece 241b.
- the tab 23b is electrically connected to the first sheet 241a through the current collecting piece 241b.
- a portion where the current collecting piece 241b and the tab 23b are connected with each other is configured as a connection structure.
- the connection structure does not protrude out of the edge 221a of the top cover plate 221 in the first direction Y. In this way, on the one hand, it is possible to reduce the space occupancy of the connection structure formed by both the current collecting piece 241b and the tab 23b in the first direction Y, which is advantageous to improve the energy density of the secondary battery 20; on the other hand, in the process in which the electrode assembly 23 is fitted into the casing 21, the connection structure formed by both the current collecting piece 241b and the tab 23b does not interfere with the casing 21.
- the tab 23b and the current collecting piece 241b are both located on one side of the first sheet 241a in the second direction Z.
- the current collecting piece 241b and the tab 23b are at least partially overlapped in the axial direction X.
- the first sheet 241a and the tab 23b are at least partially overlapped in the second direction Z. Since the dimension of the tab 23b according to the present embodiment in the second direction Z is smaller than the dimension of the end face 23a in the second direction Z, the yielding space a having larger region can be reserved in the second direction Z.
- the first sheet 241a is disposed in the yielding space and overlaps with the tab 23b in the second direction Z, such that the first sheet 241a does not occupy excessive space formed between the end face 23a of the electrode assembly 23 and the casing 21 in the first direction Y, which is advantageous to improve the energy density of the secondary battery 20.
- the first sheet 241a is disposed corresponding to the second region 230b of the end face 23a.
- the sum H of the dimension of the first sheet 241a and the dimension of the tab 23b is smaller than the dimension D of the end face 23a (see Fig. 2 ).
- the portion of the current collecting member 24 located between the end face 23a and the casing 21 does not extend across the edge of the electrode unit 231, the space occupied by the current collecting member 24 in the second direction Z is lowered, and the energy density of the secondary battery 20 is effectively improved.
- the number of electrode assemblies 23 is two groups.
- the two groups of electrode assemblies 23 are laminated in the axial direction X.
- the number of the current collecting pieces 241b is two.
- the two current collecting pieces 241b are spaced apart in the axial direction X and the two current collecting pieces 241b are at least partially overlapped in the axial direction X, which is advantageous to reduce the space occupancy of the two current collecting pieces 241b in the second direction Z.
- the tab 23b of one group of electrode assemblies 23 and the tab 23b of the other group of electrode assemblies 23 are connected to two current collecting pieces 241b, respectively.
- the tab 23b of the one group of electrode assemblies 23 and the tab 23b of the other group of electrode assemblies 23 at least partially overlap in the axial direction X.
- the two tabs 23b are aligned in the axial direction X, and the two current collecting pieces 241b are also aligned in the axial direction X.
- the tabs 23b having same electrode of the two groups of electrode assemblies 23 are connected by using two current collecting pieces 241b to achieve current collection.
- two current collecting pieces 241b it is possible to avoid the case where the temperature of the connection region between the tab 23b and the current collecting piece 241b is too high when a plurality of electrode units 231 are connected to the current collecting piece 241b through one tab 23b, and also to avoid the occurrence of pseudo soldering between the tab 23b and the current collecting piece 241b.
- the two groups of electrode assemblies 23 are laminated in the axial direction X.
- Each group of electrode assemblies 23 includes two electrode units 231.
- the electrode unit 231 has sub-end faces 231a and sub-tabs 231b extending from the sub-end faces 231a.
- the two sub-end faces 231a on the same side form the end face 23a of one electrode assembly 23, and the two sub-tabs 231b having same electrode converges to form the tab 23b of one electrode assembly 23.
- the sub-tabs 231b of one electrode unit 231 extend in the axial direction X from the region of the sub-end faces 231a adjacent to the other electrode unit 231, so that the respective sub-tabs 231b of the two electrode units 231 are close to each other and extend a short distance to converge into the tab 23b fixedly connected to the current collecting member 24.
- the sub-tab 231b does not suffer from length redundancy caused by its excessive extending length, thereby reducing the possibility of occurrence of breakage of the sub-tab 231b caused by stress concentration generated when the sub-tab 231b is bent in the case where length redundancy occurs.
- the extending dimension of the sub-tab 231b is controlled within a small range, which is advantageous to reduce the space occupancy of the tab 23b formed by the convergence of the respective sub-tabs 231b and to improve the energy density of the secondary battery 20.
- the thickness direction of the current collecting piece 241b is parallel to the axial direction X.
- the current collecting piece 241b has a predetermined length and width, wherein the length direction is parallel to the second direction Z, and the width direction is parallel to the first direction Y.
- the surface of the current collecting piece 241b for connection with the tab 23b and the surface of the tab 23b for connection with the current collecting piece 241b are substantially in the same horizontal plane, so that the tab 23b is directly connected to the surface of the current collecting piece 241b after the tab 23b protrudes directly out of the end face 23a of the electrode assembly 23.
- the tab 23b is connected to the surface of the current collecting piece 241b facing or facing away from the top cover assembly 22. In this way, the current collecting piece 241b is disposed away from the electrode assembly 23, and a sufficiently large yielding space can be reserved on opposite sides of the current collecting piece 241b in the axial direction X.
- the connecting portion 241 includes a transition portion that is connected to the first sheet 241a. In the second direction Z, the transition portion is provided on one side of the first sheet 241a.
- the current collecting piece 241b is disposed on the transition portion, so that the current collecting piece 241b is connected to the first sheet 241a through the transition portion.
- the transition portion may have a sheet-like structure whose thickness direction is parallel to the first direction Y. The transition portion can provide stable support for the current collecting piece 241b and improve the overcurrent capability between the current collecting piece 241b and the first sheet 241a.
- the current collecting piece 241b is folded with respect to the first direction Y, and the thickness direction of the current collecting piece 241b is parallel to the first direction Y.
- the tab 23b is folded with respect to the first direction Y and is fixedly connected to the surface of the current collecting piece 241b facing away from the end face 23a. Therefore, the current collecting piece 241b forms a shield for the electrode assembly 23, so that the free end of the tab 23b will not be folded to contact the end face 23a of the electrode assembly 23 during installation or later use, thereby reducing the possibility of structural damage or breakage of the electrode unit 231 generated when the tab 23b is folded to be inserted into end face 23a.
- the current collecting piece 241b may be welded to the tab 23b in a state in which its thickness direction is parallel to the axial direction X, and then the current collecting piece 241b and the tab 23b may be bent with respect to the first direction Y such that the thickness direction of the current collecting piece 241b is parallel to the first direction Y.
- the total thickness of both the current collecting piece 241b and the tab 23b is small, thereby occupying less space formed between the electrode assembly 23 and the casing 21, and effectively improving the energy density of the secondary battery 20.
- the tab 23b extending from the first region 230a is the die-cut tab and has a substantially rectangular or substantially trapezoidal cross section. Therefore, compared with the die-cut tab having the arc-shaped region with the same shape as the narrow face 231d in the cross section of the tab 23b, the tab 23b according to the present embodiment has a good folding ability, and breakage or tear of the tab 23b caused by stress concentration generated due to bending of the arc-shaped region will not occur.
- the full tab since the width of the full tab in the second direction Z is substantially same as the width of the end face 23a in the second direction Z, and the height of the full tab in the axial direction X is substantially same as the height of the end face 23a in the axial direction X, the full tab almost covers the entire end face 23a, therefore, the electrolyte cannot easily and more uniformly pass through the full tab which is not coated with the active material to be immersed into the gap between the positive electrode plate and the negative electrode plate coated with the active material.
- the tab 23b according to the present embodiment is the die-cut tab, the tab 23b covers only a part of the end face 23a, and therefore, the electrolyte can be more quickly and uniformly immersed into the gap between the positive tab and the negative tab coated with the active material through the end face 23a, thereby improving effectively the infiltration efficiency and improving the infiltration effect.
- the first sheet 241a and the tab 23b are at least partially overlapped in the axial direction X.
- the first sheet 241a and the tab 23b are distributed in the axial direction X.
- the current collecting piece 241b is connected to the end of the first sheet member 241a away from the top cover assembly 22.
- the current collecting piece 241b connected to the first sheet 241a extends along the second direction Z and is connected to the tab 23b, so that the current collecting piece 241b does not occupy more space within the casing 21 in the axial direction X, which is advantageous to reduce the dimension of the secondary battery 20 in the axial direction X or increase the dimension of the electrode assembly 23 in the axial direction X, thereby increasing the energy density of the secondary battery 20.
- the number of electrode assemblies 23 is two groups.
- the two groups of electrode assemblies 23 are laminated in the axial direction X.
- the tab 23b of one group of electrode assemblies 23 and the tab 23b of the other group of electrode assemblies 23 are spaced apart in the axial direction X and are spaced apart in the second direction Z.
- the number of the first sheets 241a and the number of the current collecting pieces 241b are respectively two and the first sheets 241a are disposed in one-to-one correspondence with the current collecting pieces 241b.
- the two first sheets 241a are spaced apart in the second direction Z.
- the two current collecting pieces 241b are spaced apart in the axial direction X and are spaced apart in the second direction Z.
- the two tabs 23b extending from the two groups of electrode assemblies 23 are also spaced apart in the axial direction X. Also, the two first sheets 241a do not overlap in the axial direction X, and the two tabs 23b do not overlap in the axial direction X.
- the two tabs 23b are respectively connected to the two current collecting pieces 241b. In this way, on the one hand, since the current collecting pieces 241b are disposed in one-to-one correspondence with the tabs 23b, the two current collecting pieces 241b and the two tabs 23b are offset in the axial direction X, which facilitates heat dissipation of the respective connection regions where the two current collecting pieces 241b and the two tabs 23b are connected.
- the ends of the two first sheets 241a are offset from each other in the second direction Z and do not overlap in the axial direction X, and the two ends are arranged in a stepwise manner in the axial direction X, and accordingly, the two current collecting pieces 241b and the two tabs 23b are also arranged in a stepwise manner in the axial direction X.
- the number of the first sheet 241a, the current collecting piece 241b, and the tab 23b is not limited to two, and may be three or more.
- the current collecting piece 241b is in a non-folded state.
- the current collecting piece 241b is substantially perpendicular to the first sheet 241a.
- the thickness direction of the current collecting piece 241b is parallel to the axial direction X.
- the current collecting piece 241b extends from the first sheet 241a toward the casing 21.
- the tab 23b may be connected to the surface of the current collecting piece 241b facing away from the top cover assembly 22.
- the surface of the current collecting piece 241b facing away from the top cover assembly 22 and the surface of the tab 23b facing the current collecting piece 241b may be substantially in the same plane.
- the tab 23b may be connected fixedly to the connecting surface of the current collecting piece 241b without bending, which reduces the possibility of the breakage or tear of the tab 23b caused by its own bending. Meanwhile, since there is a larger space on opposite sides of the current collecting pieces 241b in the axial direction X, it facilitates using an ultrasonic welding apparatus to clamp the current collecting piece 241b from the opposite sides of the current collecting piece 241b and weld the tab 23b to the current collecting piece 241b, thereby effectively reducing operation difficulty in the welding connection process.
- the current collecting piece 241b is in a folded state.
- the thickness direction of the current collecting piece 241b is parallel to the first direction Y.
- the current collecting piece 241b is folded with respect to the first direction Y such that the connecting surface faces the casing 21 or the electrode assembly 23.
- the current collecting piece 241b and the tab 23b are folded, thereby reducing the total thickness of the current collecting piece 241b and the tab 23b in the first direction Y, which is advantageous to reduce the space occupancy of both the current collecting piece 241b and the tab 23b and improve the energy density of the secondary battery 20.
- the connecting face of the current collecting piece 241b faces the casing 21.
- the end of the tab 23b connected to the connecting surface of the current collecting piece 241b does not come into contact with the electrode assembly 23 by the isolation of the current collecting piece 241b and the first sheet 241a, thereby reducing the possibility that the electrode assembly 23 is scratched or punctured by the folding of the tab 23b.
- the connecting portion 241 has a first sheet 241a extending along the axial direction X and a second sheet 241c connected to the first sheet 241a.
- the first sheet 241a is connected to the body portion 242, and the first sheet 241a is disposed to intersect with the body portion 242.
- the first sheet 241a has a stripe structure and the thickness direction of the first sheet 241a is parallel to the second direction Z.
- the second sheet 241c is connected to the first sheet 241a and extends toward the outside of the first sheet 241a in the second direction Z.
- the first sheet 241a is disposed to intersect with the second sheet 241c such that the connecting portion 241 has a substantially L-shaped cross section.
- the tab 23b can be connected to the surface of the second sheet 241c facing or facing away from the top cover assembly 22.
- the tab 23b and the second sheet 241c are at least partially overlapped in the axial direction X.
- the first sheet 241a is located on one side of the tab 23b, so that the first sheet 241a may not protrude out of the tab 23b in the first direction Y, which is advantageous to reduce the space occupancy of the first sheet 241a and improve the energy density of the secondary battery 20.
- the second sheet 241c overlaps with the tab 23b, so that the second sheet 241c may also protrude out of the tab 23b in the first direction Y, which is further advantageous to reduce the space occupancy of the first sheet 241a and improve the energy density of the secondary battery 20.
- the thickness direction of the second sheet 241c is the same as the axial direction X.
- the second sheet 241c is disposed away from the electrode assembly 23, and a sufficiently large yielding space can be reserved on opposite sides of the second sheet 241c in the axial direction X.
- the second sheet 241c and the tab 23b connected to the first sheet 241a are both located on one side of the first sheet 241a.
- the number of the first sheets 241a is two.
- the number of the second sheets 241c is also two.
- the two first sheets 241a are spaced apart in the second direction Z, and the dimensions of the two first sheets 241a in the axial direction X are not equal.
- the respective ends of the two first sheets 241a are arranged to be spaced apart in a stepwise manner in the axial direction X.
- the second sheets 241c are spaced apart in the axial direction X, and the dimensions of the two second sheets 241c in the second direction Z are not equal.
- the number of electrode assemblies 23 is two groups.
- the tab 23b of one group of electrode assemblies 23 is connected to the surface of the second sheet 241c in the two second sheets 241c adjacent to the top cover assembly 22 that faces or faces away from the top cover assembly 22, and the tab of the other group of electrode assemblies 23 is connected to the surface of the second sheet 241c in the two second sheets 241c away from the top cover assembly 22 that faces or faces away from the top cover assembly 22.
- the number of current collecting members 24 is two.
- the two current collecting members 24 are spaced apart in the first direction Y.
- the electrode assembly 23 is disposed between the two current collecting members 24.
- the two current collecting members 24 are electrically connected to the respective tabs 23b.
- the two electrode terminals 222 are disposed on the top cover plate 221, and the two current collecting members 24 are respectively welded to the two electrode terminals 222.
- a gap is reserved between the current collecting member 24 and the end face 23a of the electrode assembly 23.
- the gap can serve as a safety gap between the current collecting member 24 and the electrode assembly 23.
- the current collecting member 24 Since the current collecting member 24 is electrically connected to the positive tab or the negative tab which is drawn out from the electrode assembly 23, after the gap is reserved, the current collecting member 24 does not come into contact with the negative tab or the positive tab of the electrode unit 231, thereby avoiding occurrence of short-circuit generated when the current collecting member 24 connected to the positive tab of the electrode assembly 23 is electrically connected to the negative electrode plate of the electrode unit 231 or when the current collecting member 24 connected to the negative tab of the electrode assembly 23 is electrically connected to the positive electrode plate of the electrode unit 231, and improving the use safety of the secondary battery 20.
- the current collecting member 24 includes the current collecting piece 241b which is in the folded state, this gap can be used to provide the space for the supporting member.
- the gap has a dimension from 1.5 mm to 2 mm.
- the battery module 10 includes a plurality of secondary batteries 20 which are arranged side by side in a direction intersecting the axial direction X.
- the plurality of secondary batteries 20 may be arranged side by side in the first direction Y or the second direction Z.
- the electrode units 231 included in the respective secondary batteries 20 according to the present embodiment are laminated in the axial direction X of the receiving hole 21a of the casing 21. Therefore, when the electrode units 231 according to the present embodiment expand, expansion or deformation mainly occurs in the axial direction X of the receiving hole 21a, and the expansion amount in the direction in which the secondary batteries 20 are arranged is small. Thus, the sum of the expansion forces accumulated in the direction in which the secondary batteries 20 are arranged is small.
- a structural member with higher strength is not required for the battery module 10 to restrain or counteract the expansion force; or only a structural member with lower strength may be required to restrain or counteract the expansion force, thereby effectively reducing the overall quality of the battery module 10, making the battery module 10 itself more compact, and effectively increasing the energy density of the battery module 10.
- the battery module 10 has a small expansion amount in the thickness direction of the secondary batteries 20, which can effectively improve the safety during the use.
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Description
- The disclosure relates to the technical field of battery, and in particular, to a secondary battery and a battery module.
- With the development of science and technology, secondary batteries are widely used in portable electronic devices such as mobile phones, digital video cameras and laptop computers, and have broad application prospects in electric vehicles such as electric automobiles and electric bicycles and large or medium-sized electric devices such as energy storage facilities. Therefore, secondary batteries become important technical means to solve global problems such as energy crisis and environmental pollution. In the prior art, the electrode assembly included in the secondary battery has an end face and a full tab extending from the end face. Since the dimension of the full tab is equal to the dimension of the end face and the electrolyte mainly infiltrates through the gap in the end face, it is difficult for the electrolyte to infiltrate the entire electrode assembly quickly and uniformly in the electrolyte infiltration step, which causes poor infiltration effect and low infiltration efficiency.
- The document
US 2014349149 A1 discloses a secondary battery including: a case; a cap plate covering an opening of the case; a first electrode assembly and a second electrode assembly inside the case; a current collecting member including a first current collecting piece electrically connected to an electrode of the first electrode assembly; and a second current collecting piece electrically connected to an electrode of the second electrode assembly; a first terminal electrically connected to the first current collecting member and protruding outside the case. - The document
US 2017062792 A1 discloses a secondary battery including: a case; a cap plate at an opening of the case and defining terminal openings; a pair of electrode assemblies, each including a first electrode including a tab, a second electrode including a tab, and a separator between the first electrode and the second electrode; and first and second electrode terminals respectively connected to the tabs of the first and second electrodes and respectively passing through the terminal openings. - The document
JP 2007073317 A - The present invention relates to a secondary battery and a battery module, and is defined by the features of claim 1. The secondary battery includes an electrode assembly having an end face and a tab having a dimension smaller than that of the end face, and the electrolyte can be immersed into the interior of the electrode assembly more quickly and uniformly through the end face, thereby making the electrode assembly have high infiltration efficiency and good infiltration effect.
- In one aspect, an embodiment of the disclosure provide a secondary battery comprising a casing, which includes a receiving hole having an opening; a top cover assembly, which includes a top cover plate connected to the casing to close the opening; an electrode assembly, which is disposed within the receiving hole, the electrode assembly includes two end faces which are opposed to each other in a first direction perpendicular to an axial direction of the receiving hole and tabs extending from the end faces, the electrode assembly includes two or more electrode units which are laminated in the axial direction, and in a second direction perpendicular to the axial direction and the first direction, a dimension of the tab is smaller than a dimension of the end face; and a current collecting member, which is electrically connected to the tab; the electrode unit has two wide faces and two narrow faces connecting the two wide faces, an area of each of the two wide faces is larger than an area of each of the two narrow faces, the two wide faces are disposed to be opposite to each other in the axial direction, and the wide faces and the narrow faces are alternately disposed. The current collecting member includes a connecting portion disposed between the end face and the casing, the connecting portion has a first sheet extending along the axial direction and a current collecting piece through which the tab is electrically connected to the first sheet, the current collecting piece and the tab are folded with respect to the first direction such that the tab is connected to a surface of the current collecting piece facing away from the end face.
- According to an aspect of the embodiment of the disclosure, the end face includes a first region, a second region, and a third region that are distributed along the second direction, the tab only extents out of the first region, and the second region and the third region are respectively located on both sides of the first region.
- According to an aspect of the embodiment of the disclosure, in the second direction, a dimension of the third region is smaller than a dimension of the second region.
- According to an aspect of the embodiment of the disclosure, in the second direction, a ratio of a dimension of the tab to a dimension of the end face is 1/15 to 14/15.
- According to an aspect of the embodiment of the disclosure, the electrode assembly includes two electrode units, each of the two electrode units has two sub-end faces and a sub-tab extending from each of the two sub-end faces, two of the sub-end faces on the same side of two electrode units of the electrode assembly form the end face, and two of the sub-tabs of two electrode units of the electrode assembly having same electrode are converged to form the tab, and in the electrode assembly, the sub-tab of one of the two electrode units extends along the axial direction from the region of the sub-end face adjacent to the other of the two electrode units.
- According to an aspect of the embodiment of the disclosure, the tab extends from the region of the end face adjacent to the two adjacent wide faces of the two electrode units.
- According to an aspect of the embodiment of the disclosure, the connecting portion and the tab are at least partially overlapped in the axial direction.
- According to an aspect of the embodiment of the disclosure, the current collecting member further includes a body portion that is connected to the connecting portion, and the body portion is at least partially disposed between the electrode assembly and the top cover assembly.
- According to an aspect of the embodiment of the disclosure, the first sheet has a stripe structure and the thickness direction of the first sheet is parallel to the first direction.
- According to an aspect of the embodiment of the disclosure, a connection structure is formed by the first sheet and the tab, and the connection structure does not protrude out of an edge of the top cover plate in the first direction.
- According to an aspect of an embodiment of the disclosure, the tab and the current collecting piece are both located on one side of the first sheet in the second direction, and the current collecting piece and the tab are at least partially overlapped in the axial direction.
- According to an aspect of the embodiment of the disclosure, the number of the electrode assemblies is two groups, and the two groups of the electrode assemblies are laminated in the axial direction; the number of the current collecting pieces is two, and the two current collecting pieces are spaced apart in the axial direction and the two current collecting pieces are at least partially overlapped in the axial direction; the tab of one group of the electrode assemblies and the tab of the other group of the electrode assemblies are respectively connected to the two current collecting pieces, and the tab of the one group of the electrode assemblies and the tab of the other group of the electrode assemblies at least partially overlap in the axial direction.
- According to an aspect of the embodiment of the disclosure, the first sheet and the tab are at least partially overlapped in the axial direction.
- According to an aspect of the embodiment of the disclosure, the number of the electrode assemblies is two groups, and the two groups of the electrode assemblies are laminated in the axial direction; the number of the first sheets and the number of the current collecting pieces each is two, the first sheets are disposed in one-to-one correspondence with the current collecting pieces, the two first sheets are spaced apart in the second direction, and the two current collecting pieces are spaced apart in the axial direction and are spaced apart in the second direction; the tab of one group of the electrode assemblies and the tab of the other group of the electrode assemblies are spaced apart in the axial direction and are spaced apart in the second direction, and the two tabs are respectively connected to the two current collecting pieces.
- According to an aspect of the embodiment of the disclosure, the number of the current collecting members is two, and in the first direction, the electrode assembly is disposed between the two current collecting members, and the two current collecting members are electrically connected to the corresponding tabs..
- The secondary battery according to the embodiment of the disclosure includes a casing, an electrode assembly disposed within the casing, a top cover assembly connected to the casing, and a current collecting member electrically connected to the electrode assembly. The electrode assembly has end faces and tabs extending from the end faces. The tab of the electrode assembly is electrically connected to the current collecting member. Since the dimension of the tab according to the present embodiment is smaller than the dimension of the end face, the tab cannot completely cover the end face, so that the electrolyte can be immersed into the interior of the electrode assembly more quickly and uniformly through the region of the end face that is not covered by the tab. Thus, it is advantageous to improve the infiltration efficiency and the infiltration effect of the electrode assembly in the electrolyte infiltration step.
- In another aspect of the disclosure, there is provided a battery module including two or more secondary batteries mentioned in the above embodiments, wherein the two or more secondary batteries are arranged side by side in a direction intersecting with the axial direction.
- Features, advantages, and technical effects of the exemplary embodiments of the disclosure will be described below with reference to the drawings.
-
Fig. 1 is a schematic view showing the structure of a battery module according to an embodiment of the disclosure; -
Fig. 2 is a schematic exploded perspective view showing the structure of a secondary battery according to an embodiment of the disclosure; -
Fig. 3 is a cross-sectional view showing the structure of a secondary battery according to an embodiment of the disclosure; -
Fig. 4 is a schematic view showing the structure of an electrode unit according to an embodiment of the disclosure; -
Fig. 5 is a cross-sectional view showing the structure of an electrode unit according to an embodiment of the disclosure; -
Fig. 6 is a schematic side view showing the structure of an electrode assembly according to an embodiment of the disclosure; -
Fig. 7 is a schematic side view showing the structure of an electrode assembly according to another embodiment of the disclosure; -
Fig. 8 is a schematic view showing a state in which the current collecting member and the electrode assembly of the secondary battery shown inFig. 2 are connected; -
Fig. 9 is a schematic exploded perspective view of a secondary battery according to another embodiment of the disclosure; -
Fig. 10 is a schematic view showing a state in which the current collecting member and the electrode assembly of the secondary battery shown inFig. 9 are connected; -
Fig. 11 is a schematic exploded perspective view of a secondary battery according to still another embodiment of the disclosure; -
Fig. 12 is a schematic exploded perspective view of a secondary battery according to still another embodiment of the disclosure; -
Fig. 13 is a schematic view showing a state in which the current collecting member and the electrode assembly of the secondary battery shown inFig. 12 are connected; -
Fig. 14 is a schematic exploded perspective view of a secondary battery according to still another embodiment of the disclosure; and -
Fig. 15 is a schematic view showing the structure of the current collecting member ofFig. 14 . - In the drawings, the drawings are not drawn to scale.
-
- 10- battery module; 101- busbar;
- 20- secondary battery;
- 21- casing; 21a- receiving hole;
- 22- top cover assembly; 221- top cover plate; 221a- edge; 222- electrode terminal;
- 23- electrode assembly; 23a- end face; 23b- tab; 230a- first region; 230b- second region; 230c- third region; 231- electrode unit; 231a- sub-end surface; 231b- sub-tab; 231c-wide face; 231d- narrow face;
- 24- current collecting member; 241- connecting portion; 241a- first sheet; 241b-current collecting piece; 241c- second sheet; 242- body portion;
- 99- welding portion;
- X- axial direction; Y- first direction; Z- second direction.
- In order for better understanding of the disclosure, the
battery module 10 and thesecondary battery 20 according to the present embodiment of the disclosure will be described in detail below with reference toFigs. 1 to 15 . - Referring to
Fig. 1 , an embodiment of the disclosure provides abattery module 10, which includes two or moresecondary batteries 20 according to the present embodiment and abusbar 101 for connecting twosecondary batteries 20. The two or moresecondary batteries 20 are arranged side by side in the same direction. One end of thebusbar 101 is fixedly connected to one of the twosecondary batteries 20, and the other end thereof is connected fixedly to the other of thesecondary batteries 20. - Referring to
Figs. 2 and3 , thesecondary battery 20 according to the present embodiment of the disclosure includes acasing 21, anelectrode assembly 23 disposed within thecasing 21, and atop cover assembly 22 sealingly connected to thecasing 21. - The
casing 21 according to the present embodiment may have a quadrangular shape or other shape. Thecasing 21 includes a receivinghole 21a having an opening. The receivinghole 21a is used for receiving theelectrode assembly 23 and the electrolyte. Thecasing 21 may be made of a material such as aluminum, aluminum alloy, or plastic. - The
electrode assembly 23 according to the present embodiment of the disclosure includes two end faces 23a which are opposed to each other in a first direction Y perpendicular to an axial direction X of the receivinghole 21a andtabs 23b extending from the end faces 23a, wherein the axial direction X of the receivinghole 21a is the same as the direction along which the receivinghole 21a extends. In the present embodiment, onetab 23b extends from eachend face 23a of theelectrode assembly 23. Theelectrode assembly 23 has twotabs 23b which are opposed to each other in the first direction Y, one of which serves as the positive tab and the other of which serves as the negative tab. Theelectrode assembly 23 according to the present embodiment has a dimension of 0.01 mm to 1000 mm in the axial direction X. Therefore, it is possible to ensure that the fitting dimension of theelectrode assembly 23 according to the present embodiment can be flexibly selected according to the use requirements of the product. - Referring to
Figs. 4 and5 , theelectrode assembly 23 according to the present embodiment includes two ormore electrode units 231 which are laminated in the axial direction X of the receivinghole 21a. Theelectrode unit 231 hassub-end faces 231a and sub-tabs 231b extending from the sub-end faces 231a. The body and the sub-tabs 231b connected to the body of theelectrode unit 231 according to the present embodiment may be formed by stacking or winding a first electrode plate, a second electrode plate, and a separator together. The separator is an insulator between the first electrode plate and the second electrode plate. Theelectrode unit 231 according to the present embodiment includes a layer of the separator, a layer of the first electrode plate, and a layer of the second electrode plate which are wound together. In the present embodiment, the first electrode plate is exemplified as a positive electrode plate, and the second electrode plate is a negative electrode plate. Similarly, in other embodiments, the first electrode plate may also be a negative electrode plate, and the second electrode plate is a positive electrode plate. Further, the positive-electrode active material is coated onto the coating region of the positive electrode plate, and the negative-electrode active material is coated onto the coating region of the negative electrode plate. A plurality of uncoated regions extending from the body serve as the sub-tabs 231b. Eachelectrode unit 231 includes two sub-tabs 231b, i.e., a positive tab and a negative tab, which are opposite to each other in the first direction Y. The first direction Y is perpendicular to the axial direction X. Theend face 23a of oneelectrode assembly 23 includes the sub-end faces 231a of therespective electrode units 231, that is, the sub-end faces 231a on the same sides of all therespective electrode units 231 collectively form theend face 23a. Thetab 23b of oneelectrode assembly 23 includes the sub-tabs 231b of therespective electrode units 231, that is, thetabs 231b having same electrode of all therespective electrode units 231 collectively converge to form thetab 23b. In one embodiment, as shown inFig. 4 , theelectrode unit 231 has a flat structure having twowide faces 231c and twonarrow faces 231d connecting the twowide faces 231c. The area of thewide face 231c is larger than the area of thenarrow face 231d. The twowide faces 231c are disposed to be opposite to each other in the axial direction X. The wide faces 231c of theelectrode unit 231 face thetop cover assembly 22. The wide faces 231c and the narrow faces 231d of theelectrode unit 231 are alternately disposed. The positive sub-tab 231b extends from the coating region of the positive electrode plate, and the negative sub-tab 231b extends from the coating region of the negative electrode plate. In the electrolyte infiltration step of the production process or later use of thesecondary battery 20, the active material layer included in theelectrode unit 231 according to the present embodiment may expand, which causes theelectrode unit 231 as a whole to expand. Alternatively, theelectrode unit 231 of the embodiment has a capacity of 5Ah to 500 Ah. - The
electrode assembly 23 according to the present embodiment includes twoelectrode units 231. Each of the twoelectrode unit 231 hassub-end faces 231a and sub-tabs 231b extending from the sub-end faces 231a. In the first direction Y, the twosub-end faces 231a on the same side form oneend face 23a of theelectrode assembly 23. The two sub-tabs 231b having same electrode converge to form thetab 23b of theelectrode assembly 23. In one embodiment, the sub-tab 231b of oneelectrode unit 231 extends in the axial direction X from the region of thesub-end face 231a adjacent to theother electrode unit 231, so that the respective sub-tabs 231b of the twoelectrode units 231 are close to each other and extend a short distance to converge into thetab 23b fixedly connected to the current collectingmember 24. In this way, on the one hand, the sub-tab 231b does not suffer from length redundancy (such redundancy causes the sub-tab 231b be easily inserted inside theelectrode assembly 23 when bent to result in short-circuit); on the other hand, the extending dimension of the sub-tab 231b is controlled within a small range, which is advantageous to improve the overall compactness of thetab 23b formed by the convergence of the respective sub-tabs 231b, to reduce the overall space occupancy of thetab 23b, and to improve the energy density of thesecondary battery 20. - The two or
more electrode units 231 according to the present embodiment are laminated within thecasing 21 in the axial direction X. When theelectrode units 231 expand, theelectrode assembly 23 generates a first expansion force along a second direction Z perpendicular to both the axial direction X and the first direction Y and a second expansion force along the axial direction X. Since the two ormore electrode unit 231 are laminated and the area of thewide face 231c is larger than the area of thenarrow face 231d, the first expansion force is smaller than the second expansion force. Therefore, expansion of theelectrode assembly 23 mainly occurs along the axial direction X, so that the expansion force of theelectrode assembly 23 is mainly in the axial direction X, while the first expansion force along the second direction Z is relatively small. Thereby, thecasing 21 may not substantially deformed due to the small first expansion force. When the two or moresecondary batteries 20 according to the present embodiment are arranged side by side in the second direction Z to form thebattery module 10, since the second expansion force generated when eachsecondary battery 20 expands intersects with the second direction Z, that is, since the direction of the second expansion force generated by expansion of eachsecondary battery 20 is in the axial direction X, the second expansion force generated by eachsecondary battery 20 does not accumulate to form a large resultant force along the second direction Z. Thus, when thebattery module 10 including two or moresecondary batteries 20 according to the present embodiment is fixed in the second direction Z by using the external fixing member, the requirements for rigidity and strength of the fixing member is low, which is advantageous to reduce the volume or weight of the fixing member, further to improve the energy density and space utilization of thesecondary battery 20 and theoverall battery module 10, and further to improve the cycle performance of thesecondary battery 20. - In the present embodiment of the disclosure, as shown in
Fig. 2 , in the second direction Z, the dimension L of thetab 23b is smaller than the dimension D of theend face 23a, that is, in the second direction Z, thetab 23b according to the present embodiment is narrower than theend face 23a, so that thetab 23b according to the present embodiment is a die-cut tab. Since thetab 23b according to the present embodiment is narrower than theend face 23a, the area of theend face 23a covered by thetab 23b is reduced while the area where theend face 23a is exposed to the outside is larger, so that the electrolyte can enter into theelectrode unit 231 from the portion of theend face 23a other than the portion covered by thetab 23b in the electrolyte infiltration step. Since there is only a short distance from theend face 23a to the first electrode plate or the second electrode plate with the coating region, the electrolyte can enter more quickly and uniformly into the gap between the positive electrode plate with the coating region and the separator or the gap between the negative electrode plate with the coating region and the separator, which is advantageous to improve infiltration efficiency and infiltration effect. In one embodiment, in the second direction Z, the ratio of the dimension L of thetab 23b to the dimension D of theend face 23a is 1/15 to 14/15. When the ratio of the dimension L of thetab 23b to the dimension D of theend face 23a is less than 1/15, the overcurrent capability of thetab 23b is weak. When the ratio of the dimension L of thetab 23b to the dimension D of theend face 23a is larger than 14/15, the infiltration efficiency is low and the infiltration effect is poor. - Referring to
Fig. 3 , thetop cover assembly 22 according to the present embodiment is sealingly connected to thecasing 21 to close the opening. In one embodiment, thetop cover assembly 22 includes atop cover plate 221 andelectrode terminals 222. Thetop cover assembly 22 is sealingly connected to thecasing 21 by thetop cover plate 221. Thetop cover plate 221 and the electrode terminals are located on one side of theelectrode assembly 23 in the axial direction X. Theelectrode terminals 222 are disposed on thetop cover plate 221 and are electrically connected to theelectrode assembly 23 through thecurrent collecting members 24. According to this embodiment, theelectrode terminal 222 and the current collectingmember 24 are connected by welding. In this way, on the one hand, no additional connecting member is required to connect theelectrode terminal 222 and the current collectingmember 24, thereby reducing the number of the used components. On the other hand, during the welding process of theelectrode terminal 222 and the current collectingmember 24, the both melt and mix with each other, so that after the welding is completed, the both are structurally embedded with each other to improve the connection strength of the both, and theelectrode terminal 222 and the current collectingmember 24 are less likely to be separated from each other when thesecondary battery 20 is subjected to external vibration, and therefore, the use safety and stability of thesecondary battery 20 are improved. Theelectrode terminal 222 and the current collectingmember 24 according to the present embodiment are welded to form a weldedportion 99. Alternatively, theelectrode terminal 222 and the current collectingmember 24 according to the present embodiment may be connected by means of hot-melt welding. - In one embodiment, as shown in
Figs. 6 and7 , in the second direction Z, theend face 23a includes afirst region 230a, asecond region 230b, and athird region 230c. Thetab 23b extends only from thefirst region 230a. Thesecond region 230b is located on one side of thefirst region 230a, and thethird region 230c is located on the other side of thefirst region 230a, that is, thethird region 230c and thesecond region 230b are respectively located on both sides of thefirst region 230a, so that thetab 23b according to the present embodiment extending from thefirst region 230a is formed as a die-cut tab. Thetab 23b has a substantially rectangular or substantially trapezoidal cross section. Further, the dimension of thethird region 230c is smaller than the dimension of thesecond region 230b such that thetab 23b according to the present embodiment is closer to the othernarrow face 231d than onenarrow face 231d. In one example, referring toFig. 6 , the number ofelectrode assemblies 23 is two. The twoelectrode assemblies 23 are laminated in the axial direction X. Thefirst regions 230a, thesecond regions 230b, and thethird regions 230c of the twoelectrode assemblies 23 are substantially aligned in the axial direction X, respectively, such that the twotabs 23b having same electrode are also substantially aligned in the axial direction X. In another example, referring toFig. 7 , the number ofelectrode assemblies 23 is two. The twoelectrode assemblies 23 are laminated in the axial direction X. One of the twoelectrode assemblies 23 is disposed to be rotated 180° with respect to the other of the twoelectrode assemblies 23 such that thefirst regions 230a, thesecond regions 230b, andthird regions 230c of the twoelectrode assemblies 23 do not correspond in the axial direction X, respectively. The twotabs 23b having same electrode of the twoelectrode assemblies 23 differ in position, and the twotabs 23b having same electrode do not overlap in the axial direction X. - Referring to
Fig. 3 , the current collectingmember 24 according to the present embodiment of the disclosure includes a connectingportion 241 located between theend face 23a and thecasing 21 and abody portion 242 connected to the connectingportion 241. The connectingportion 241 and thetab 23b are at least partially overlapped in the axial direction X, thereby reducing the space occupancy of the connectingportion 241 and thetab 23b in the first direction Y, which is advantageous to improve the energy density of thesecondary battery 20. Thebody portion 242 is at least partially located between theelectrode assembly 23 and thetop cover assembly 22. In one embodiment, a portion of thebody portion 242 located between theelectrode assembly 23 and thetop cover assembly 22 is welded to theelectrode terminal 222. In one embodiment, thebody portion 242 includes a sheet-like body that is connected to the connectingportion 241 and bosses that protrude from the sheet-like body. The thickness direction of the sheet-like body is parallel to the axial direction X. The bosses protrude toward theelectrode terminal 222 along the axial direction. Thebody portion 242 is welded to theelectrode terminal 222 by the bosses. Thetop cover plate 221 is provided with an electrode lead-out hole, and the boss extends at least partially into the electrode lead-out hole to be welded to theelectrode terminal 222, thereby reducing the space occupancy of thebody portion 242 in the axial direction X, which is advantageous to improve the energy density of thesecondary battery 20. - In one embodiment, referring to
Fig. 2 , the connectingportion 241 has afirst sheet 241a extending along the axial direction X. Thetab 23b is electrically connected to thefirst sheet 241a. Thefirst sheet 241a has a stripe structure and the thickness direction of thefirst sheet 241a is parallel to the first direction Y, thereby reducing the dimension of thefirst sheet 241a in the first direction Y, which is advantageous to reduce the space occupancy of thefirst sheet 241a in the first direction Y and to improve the energy density of thesecondary battery 20. Alternatively, thefirst sheet 241a has a rectangular structure. Further, the connectingportion 241 further has acurrent collecting piece 241b. Thetab 23b is electrically connected to thefirst sheet 241a through thecurrent collecting piece 241b. A portion where thecurrent collecting piece 241b and thetab 23b are connected with each other is configured as a connection structure. The connection structure does not protrude out of theedge 221a of thetop cover plate 221 in the first direction Y. In this way, on the one hand, it is possible to reduce the space occupancy of the connection structure formed by both thecurrent collecting piece 241b and thetab 23b in the first direction Y, which is advantageous to improve the energy density of thesecondary battery 20; on the other hand, in the process in which theelectrode assembly 23 is fitted into thecasing 21, the connection structure formed by both thecurrent collecting piece 241b and thetab 23b does not interfere with thecasing 21. - In one embodiment, the
tab 23b and thecurrent collecting piece 241b are both located on one side of thefirst sheet 241a in the second direction Z. Thecurrent collecting piece 241b and thetab 23b are at least partially overlapped in the axial direction X. Thefirst sheet 241a and thetab 23b are at least partially overlapped in the second direction Z. Since the dimension of thetab 23b according to the present embodiment in the second direction Z is smaller than the dimension of theend face 23a in the second direction Z, the yielding space a having larger region can be reserved in the second direction Z. Therefore, at least a portion of thefirst sheet 241a according to the present embodiment is disposed in the yielding space and overlaps with thetab 23b in the second direction Z, such that thefirst sheet 241a does not occupy excessive space formed between theend face 23a of theelectrode assembly 23 and thecasing 21 in the first direction Y, which is advantageous to improve the energy density of thesecondary battery 20. Thefirst sheet 241a is disposed corresponding to thesecond region 230b of theend face 23a. Preferably, in the present embodiment, as shown inFig. 8 , in the second direction Z, the sum H of the dimension of thefirst sheet 241a and the dimension of thetab 23b is smaller than the dimension D of theend face 23a (seeFig. 2 ). Therefore, it is possible to ensure that in the second direction Z, the portion of the current collectingmember 24 located between theend face 23a and thecasing 21 does not extend across the edge of theelectrode unit 231, the space occupied by the current collectingmember 24 in the second direction Z is lowered, and the energy density of thesecondary battery 20 is effectively improved. - In one embodiment, the number of
electrode assemblies 23 is two groups. The two groups ofelectrode assemblies 23 are laminated in the axial direction X. The number of thecurrent collecting pieces 241b is two. The twocurrent collecting pieces 241b are spaced apart in the axial direction X and the twocurrent collecting pieces 241b are at least partially overlapped in the axial direction X, which is advantageous to reduce the space occupancy of the twocurrent collecting pieces 241b in the second direction Z. Thetab 23b of one group ofelectrode assemblies 23 and thetab 23b of the other group ofelectrode assemblies 23 are connected to twocurrent collecting pieces 241b, respectively. Thetab 23b of the one group ofelectrode assemblies 23 and thetab 23b of the other group ofelectrode assemblies 23 at least partially overlap in the axial direction X. Preferably, the twotabs 23b are aligned in the axial direction X, and the twocurrent collecting pieces 241b are also aligned in the axial direction X. - In the present embodiment, the
tabs 23b having same electrode of the two groups ofelectrode assemblies 23 are connected by using twocurrent collecting pieces 241b to achieve current collection. In this way, on the one hand, it is possible to avoid the case where the temperature of the connection region between thetab 23b and thecurrent collecting piece 241b is too high when a plurality ofelectrode units 231 are connected to thecurrent collecting piece 241b through onetab 23b, and also to avoid the occurrence of pseudo soldering between thetab 23b and thecurrent collecting piece 241b. On the other hand, only a shorter dimension is required for thetab 23b to be extended to be connected fixedly to the correspondingcurrent collecting piece 241b, and accordingly it is not necessary for thetab 23b to be extended beyond theend face 23a to be too long and then to be connected to thecurrent collecting piece 241b, thereby ensuring uniform processing dimension and uniform processing steps of theelectrode unit 231, and reducing processing difficulty and processing cost. In one embodiment, the two groups ofelectrode assemblies 23 are laminated in the axial direction X. Each group ofelectrode assemblies 23 includes twoelectrode units 231. Theelectrode unit 231 hassub-end faces 231a and sub-tabs 231b extending from the sub-end faces 231a. In the first direction Y, the twosub-end faces 231a on the same side form theend face 23a of oneelectrode assembly 23, and the two sub-tabs 231b having same electrode converges to form thetab 23b of oneelectrode assembly 23. Further, the sub-tabs 231b of oneelectrode unit 231 extend in the axial direction X from the region of thesub-end faces 231a adjacent to theother electrode unit 231, so that the respective sub-tabs 231b of the twoelectrode units 231 are close to each other and extend a short distance to converge into thetab 23b fixedly connected to the current collectingmember 24. In this way, on the one hand, the sub-tab 231b does not suffer from length redundancy caused by its excessive extending length, thereby reducing the possibility of occurrence of breakage of the sub-tab 231b caused by stress concentration generated when the sub-tab 231b is bent in the case where length redundancy occurs. On the other hand, the extending dimension of the sub-tab 231b is controlled within a small range, which is advantageous to reduce the space occupancy of thetab 23b formed by the convergence of the respective sub-tabs 231b and to improve the energy density of thesecondary battery 20. - In one embodiment, referring to
Fig. 8 , the thickness direction of thecurrent collecting piece 241b is parallel to the axial direction X. Thecurrent collecting piece 241b has a predetermined length and width, wherein the length direction is parallel to the second direction Z, and the width direction is parallel to the first direction Y. The surface of thecurrent collecting piece 241b for connection with thetab 23b and the surface of thetab 23b for connection with thecurrent collecting piece 241b are substantially in the same horizontal plane, so that thetab 23b is directly connected to the surface of thecurrent collecting piece 241b after thetab 23b protrudes directly out of theend face 23a of theelectrode assembly 23. In this way, it is not necessary to bend thetab 23b to connect the bended free end to thecurrent collecting piece 241b, thereby avoid the occurrence of crack or breakage of thetab 23b caused by excessive tensile stress due to bending, reducing the probability of the failure of theelectrode assembly 23 due to damage of thetab 23b, improving the yield of thesecondary battery 20, and effectively reducing the production cost. Thetab 23b is connected to the surface of thecurrent collecting piece 241b facing or facing away from thetop cover assembly 22. In this way, thecurrent collecting piece 241b is disposed away from theelectrode assembly 23, and a sufficiently large yielding space can be reserved on opposite sides of thecurrent collecting piece 241b in the axial direction X. This facilitates the ultrasonic device to clamp thecurrent collecting piece 241b from the opposite sides of thecurrent collecting piece 241b along the axial direction X when thecurrent collecting piece 241b and thetab 23b are ultrasonically welded, thereby facilitating the ultrasonic welding operation. In one example, the connectingportion 241 includes a transition portion that is connected to thefirst sheet 241a. In the second direction Z, the transition portion is provided on one side of thefirst sheet 241a. Thecurrent collecting piece 241b is disposed on the transition portion, so that thecurrent collecting piece 241b is connected to thefirst sheet 241a through the transition portion. The transition portion may have a sheet-like structure whose thickness direction is parallel to the first direction Y. The transition portion can provide stable support for thecurrent collecting piece 241b and improve the overcurrent capability between thecurrent collecting piece 241b and thefirst sheet 241a. - In another embodiment, referring to
Figs. 9 and10 , thecurrent collecting piece 241b is folded with respect to the first direction Y, and the thickness direction of thecurrent collecting piece 241b is parallel to the first direction Y. In one example, thetab 23b is folded with respect to the first direction Y and is fixedly connected to the surface of thecurrent collecting piece 241b facing away from theend face 23a. Therefore, thecurrent collecting piece 241b forms a shield for theelectrode assembly 23, so that the free end of thetab 23b will not be folded to contact theend face 23a of theelectrode assembly 23 during installation or later use, thereby reducing the possibility of structural damage or breakage of theelectrode unit 231 generated when thetab 23b is folded to be inserted intoend face 23a. Thecurrent collecting piece 241b may be welded to thetab 23b in a state in which its thickness direction is parallel to the axial direction X, and then thecurrent collecting piece 241b and thetab 23b may be bent with respect to the first direction Y such that the thickness direction of thecurrent collecting piece 241b is parallel to the first direction Y. Thus, in the first direction Y, the total thickness of both thecurrent collecting piece 241b and thetab 23b is small, thereby occupying less space formed between theelectrode assembly 23 and thecasing 21, and effectively improving the energy density of thesecondary battery 20. - In this embodiment, the
tab 23b extending from thefirst region 230a is the die-cut tab and has a substantially rectangular or substantially trapezoidal cross section. Therefore, compared with the die-cut tab having the arc-shaped region with the same shape as thenarrow face 231d in the cross section of thetab 23b, thetab 23b according to the present embodiment has a good folding ability, and breakage or tear of thetab 23b caused by stress concentration generated due to bending of the arc-shaped region will not occur. In theelectrode unit 231 having the full tab, since the width of the full tab in the second direction Z is substantially same as the width of theend face 23a in the second direction Z, and the height of the full tab in the axial direction X is substantially same as the height of theend face 23a in the axial direction X, the full tab almost covers theentire end face 23a, therefore, the electrolyte cannot easily and more uniformly pass through the full tab which is not coated with the active material to be immersed into the gap between the positive electrode plate and the negative electrode plate coated with the active material. Since thetab 23b according to the present embodiment is the die-cut tab, thetab 23b covers only a part of theend face 23a, and therefore, the electrolyte can be more quickly and uniformly immersed into the gap between the positive tab and the negative tab coated with the active material through theend face 23a, thereby improving effectively the infiltration efficiency and improving the infiltration effect. - In one embodiment, referring to
Figs. 11 to 13 , thefirst sheet 241a and thetab 23b are at least partially overlapped in the axial direction X. Thefirst sheet 241a and thetab 23b are distributed in the axial direction X. Thecurrent collecting piece 241b is connected to the end of thefirst sheet member 241a away from thetop cover assembly 22. Thecurrent collecting piece 241b connected to thefirst sheet 241a extends along the second direction Z and is connected to thetab 23b, so that thecurrent collecting piece 241b does not occupy more space within thecasing 21 in the axial direction X, which is advantageous to reduce the dimension of thesecondary battery 20 in the axial direction X or increase the dimension of theelectrode assembly 23 in the axial direction X, thereby increasing the energy density of thesecondary battery 20. - In one example, the number of
electrode assemblies 23 is two groups. The two groups ofelectrode assemblies 23 are laminated in the axial direction X. Thetab 23b of one group ofelectrode assemblies 23 and thetab 23b of the other group ofelectrode assemblies 23 are spaced apart in the axial direction X and are spaced apart in the second direction Z. The number of thefirst sheets 241a and the number of thecurrent collecting pieces 241b are respectively two and thefirst sheets 241a are disposed in one-to-one correspondence with thecurrent collecting pieces 241b. The twofirst sheets 241a are spaced apart in the second direction Z. The twocurrent collecting pieces 241b are spaced apart in the axial direction X and are spaced apart in the second direction Z. The twotabs 23b extending from the two groups ofelectrode assemblies 23 are also spaced apart in the axial direction X. Also, the twofirst sheets 241a do not overlap in the axial direction X, and the twotabs 23b do not overlap in the axial direction X. The twotabs 23b are respectively connected to the twocurrent collecting pieces 241b. In this way, on the one hand, since thecurrent collecting pieces 241b are disposed in one-to-one correspondence with thetabs 23b, the twocurrent collecting pieces 241b and the twotabs 23b are offset in the axial direction X, which facilitates heat dissipation of the respective connection regions where the twocurrent collecting pieces 241b and the twotabs 23b are connected. On the other hand, since the twofirst sheets 241a are spaced apart in the second direction Z and the twofirst sheets 241a are spaced apart in the axial direction X, when thecurrent collecting pieces 241b are welded to the two correspondingtabs 23b, the case where the welding operation cannot be carried out or welding difficulty is increased, which is caused by positional interference between two adjacent current collectingpieces 241b or two adjacentfirst sheets 241a, may not occur. Alternatively, the ends of the twofirst sheets 241a are offset from each other in the second direction Z and do not overlap in the axial direction X, and the two ends are arranged in a stepwise manner in the axial direction X, and accordingly, the twocurrent collecting pieces 241b and the twotabs 23b are also arranged in a stepwise manner in the axial direction X. It can be appreciated that the number of thefirst sheet 241a, thecurrent collecting piece 241b, and thetab 23b is not limited to two, and may be three or more. - Alternatively, referring to
Fig. 11 , thecurrent collecting piece 241b is in a non-folded state. Thecurrent collecting piece 241b is substantially perpendicular to thefirst sheet 241a. The thickness direction of thecurrent collecting piece 241b is parallel to the axial direction X. Thecurrent collecting piece 241b extends from thefirst sheet 241a toward thecasing 21. In one example, thetab 23b may be connected to the surface of thecurrent collecting piece 241b facing away from thetop cover assembly 22. The surface of thecurrent collecting piece 241b facing away from thetop cover assembly 22 and the surface of thetab 23b facing thecurrent collecting piece 241b may be substantially in the same plane. To certain extent, thetab 23b may be connected fixedly to the connecting surface of thecurrent collecting piece 241b without bending, which reduces the possibility of the breakage or tear of thetab 23b caused by its own bending. Meanwhile, since there is a larger space on opposite sides of thecurrent collecting pieces 241b in the axial direction X, it facilitates using an ultrasonic welding apparatus to clamp thecurrent collecting piece 241b from the opposite sides of thecurrent collecting piece 241b and weld thetab 23b to thecurrent collecting piece 241b, thereby effectively reducing operation difficulty in the welding connection process. - Alternatively, referring to
Figs. 12 and13 , thecurrent collecting piece 241b is in a folded state. The thickness direction of thecurrent collecting piece 241b is parallel to the first direction Y. Thecurrent collecting piece 241b is folded with respect to the first direction Y such that the connecting surface faces thecasing 21 or theelectrode assembly 23. After thecurrent collecting piece 241b is connected fixedly to thetab 23b, thecurrent collecting piece 241b and thetab 23b are folded, thereby reducing the total thickness of thecurrent collecting piece 241b and thetab 23b in the first direction Y, which is advantageous to reduce the space occupancy of both thecurrent collecting piece 241b and thetab 23b and improve the energy density of thesecondary battery 20. Preferably, the connecting face of thecurrent collecting piece 241b faces thecasing 21. The end of thetab 23b connected to the connecting surface of thecurrent collecting piece 241b does not come into contact with theelectrode assembly 23 by the isolation of thecurrent collecting piece 241b and thefirst sheet 241a, thereby reducing the possibility that theelectrode assembly 23 is scratched or punctured by the folding of thetab 23b. - In one embodiment, as shown in
Figs. 14 and15 , the connectingportion 241 has afirst sheet 241a extending along the axial direction X and asecond sheet 241c connected to thefirst sheet 241a. Thefirst sheet 241a is connected to thebody portion 242, and thefirst sheet 241a is disposed to intersect with thebody portion 242. Thefirst sheet 241a has a stripe structure and the thickness direction of thefirst sheet 241a is parallel to the second direction Z. Thesecond sheet 241c is connected to thefirst sheet 241a and extends toward the outside of thefirst sheet 241a in the second direction Z. Thefirst sheet 241a is disposed to intersect with thesecond sheet 241c such that the connectingportion 241 has a substantially L-shaped cross section. Thetab 23b can be connected to the surface of thesecond sheet 241c facing or facing away from thetop cover assembly 22. Thetab 23b and thesecond sheet 241c are at least partially overlapped in the axial direction X. In the second direction Z, thefirst sheet 241a is located on one side of thetab 23b, so that thefirst sheet 241a may not protrude out of thetab 23b in the first direction Y, which is advantageous to reduce the space occupancy of thefirst sheet 241a and improve the energy density of thesecondary battery 20. In the axial direction X, thesecond sheet 241c overlaps with thetab 23b, so that thesecond sheet 241c may also protrude out of thetab 23b in the first direction Y, which is further advantageous to reduce the space occupancy of thefirst sheet 241a and improve the energy density of thesecondary battery 20. In one embodiment, the thickness direction of thesecond sheet 241c is the same as the axial direction X. Thesecond sheet 241c is disposed away from theelectrode assembly 23, and a sufficiently large yielding space can be reserved on opposite sides of thesecond sheet 241c in the axial direction X. This facilitates the ultrasonic device to clamp thecurrent collecting piece 241b from the opposite sides of thecurrent collecting piece 241b in the axial direction X when thecurrent collecting piece 241b and thetab 23b are ultrasonically welded, thereby facilitating the ultrasonic welding operation. In one example, in the second direction Z, thesecond sheet 241c and thetab 23b connected to thefirst sheet 241a are both located on one side of thefirst sheet 241a. In one example, the number of thefirst sheets 241a is two. The number of thesecond sheets 241c is also two. The twofirst sheets 241a are spaced apart in the second direction Z, and the dimensions of the twofirst sheets 241a in the axial direction X are not equal. The respective ends of the twofirst sheets 241a are arranged to be spaced apart in a stepwise manner in the axial direction X. Thesecond sheets 241c are spaced apart in the axial direction X, and the dimensions of the twosecond sheets 241c in the second direction Z are not equal. The number ofelectrode assemblies 23 is two groups. Thetab 23b of one group ofelectrode assemblies 23 is connected to the surface of thesecond sheet 241c in the twosecond sheets 241c adjacent to thetop cover assembly 22 that faces or faces away from thetop cover assembly 22, and the tab of the other group ofelectrode assemblies 23 is connected to the surface of thesecond sheet 241c in the twosecond sheets 241c away from thetop cover assembly 22 that faces or faces away from thetop cover assembly 22. - In one embodiment, the number of
current collecting members 24 is two. The twocurrent collecting members 24 are spaced apart in the first direction Y. In the first direction Y, theelectrode assembly 23 is disposed between the twocurrent collecting members 24. The twocurrent collecting members 24 are electrically connected to therespective tabs 23b. Correspondingly, the twoelectrode terminals 222 are disposed on thetop cover plate 221, and the twocurrent collecting members 24 are respectively welded to the twoelectrode terminals 222. - In one embodiment, as shown in
Fig. 3 , in the first direction Y, a gap is reserved between the current collectingmember 24 and theend face 23a of theelectrode assembly 23. In this way, on the one hand, the gap can serve as a safety gap between the current collectingmember 24 and theelectrode assembly 23. Since the current collectingmember 24 is electrically connected to the positive tab or the negative tab which is drawn out from theelectrode assembly 23, after the gap is reserved, the current collectingmember 24 does not come into contact with the negative tab or the positive tab of theelectrode unit 231, thereby avoiding occurrence of short-circuit generated when the current collectingmember 24 connected to the positive tab of theelectrode assembly 23 is electrically connected to the negative electrode plate of theelectrode unit 231 or when the current collectingmember 24 connected to the negative tab of theelectrode assembly 23 is electrically connected to the positive electrode plate of theelectrode unit 231, and improving the use safety of thesecondary battery 20. On the other hand, in the embodiment where the current collectingmember 24 includes thecurrent collecting piece 241b which is in the folded state, this gap can be used to provide the space for the supporting member. After the support member is inserted into the gap, a folding operation is performed to thecurrent collecting piece 241b by applying an external force using an auxiliary tool, so that the supporting member can prevent thecurrent collecting piece 241b from being inserted into theelectrode unit 231 under the external force, thereby preventing thecurrent collecting piece 241b from being inserted into theelectrode unit 231 during folding to damage to the structure of theelectrode unit 231. Alternatively, in the first direction Y, the gap has a dimension from 1.5 mm to 2 mm. - The
battery module 10 according to the present embodiment of the disclosure includes a plurality ofsecondary batteries 20 which are arranged side by side in a direction intersecting the axial direction X. In the present embodiment, the plurality ofsecondary batteries 20 may be arranged side by side in the first direction Y or the second direction Z. Theelectrode units 231 included in the respectivesecondary batteries 20 according to the present embodiment are laminated in the axial direction X of the receivinghole 21a of thecasing 21. Therefore, when theelectrode units 231 according to the present embodiment expand, expansion or deformation mainly occurs in the axial direction X of the receivinghole 21a, and the expansion amount in the direction in which thesecondary batteries 20 are arranged is small. Thus, the sum of the expansion forces accumulated in the direction in which thesecondary batteries 20 are arranged is small. In the direction in which thesecondary batteries 20 are arranged, a structural member with higher strength is not required for thebattery module 10 to restrain or counteract the expansion force; or only a structural member with lower strength may be required to restrain or counteract the expansion force, thereby effectively reducing the overall quality of thebattery module 10, making thebattery module 10 itself more compact, and effectively increasing the energy density of thebattery module 10. At the same time, thebattery module 10 has a small expansion amount in the thickness direction of thesecondary batteries 20, which can effectively improve the safety during the use.
Claims (16)
- A secondary battery (20), comprising:a casing (21), which includes a receiving hole (21a) having an opening;a top cover assembly (22), which includes a top cover plate (221) connected to the casing (21) to close the opening;an electrode assembly (23), which is disposed within the receiving hole (21a), the electrode assembly (23) includes two end faces (23a) which are opposed to each other in a first direction (Y) perpendicular to an axial direction (X) of the receiving hole (21a) and tabs (23b) extending from the end faces (23a), the electrode assembly (23) further includes two or more electrode units (231) which are laminated in the axial direction (X), and in a second direction (Z) perpendicular to the axial direction (X) and the first direction (Y), a dimension of the tab (23b) is smaller than a dimension of the end face (23a); anda current collecting member (24), which is electrically connected to the tab (23b),wherein the electrode unit (231) has two wide faces (231c) and two narrow faces (231d) connecting the two wide faces (231c), an area of each of the two wide faces (231c) is larger than an area of each of the two narrow faces (231d), the two wide faces (231c) are disposed to be opposite to each other in the axial direction (X), and the two wide faces (231c) and the two narrow faces (231d) are alternately disposed; andwherein the current collecting member (24) includes a connecting portion (241) disposed between the end face (23a) and the casing (21), the connecting portion (241) has a first sheet (241a) extending along the axial direction (X) and a current collecting piece (241b) through which the tab (23b) is electrically connected to the first sheet (241a), the current collecting piece (241b) and the tab (23b) are folded with respect to the first direction (Y) such that the tab (23b) is connected to a surface of the current collecting piece (241b) facing away from the end face (23a).
- The secondary battery (20) according to claim 1, wherein the end face (23a) includes a first region (230a), a second region (230b), and a third region (230c) that are distributed along the second direction (Z), the tab (23b) only extents out of the first region (230a), and the second region (230b) and the third region (230c) are respectively located on both sides of the first region (230a).
- The secondary battery (20) according to claim 2, wherein in the second direction (Z), a dimension of the third region (230c) is smaller than a dimension of the second region (230b).
- The secondary battery (20) according to claim 2 or 3, wherein in the second direction (Z), a ratio of a dimension of the tab (23b) to a dimension of the end face (23a) is 1/15 to 14/15.
- The secondary battery (20) according to any one of claims 1 to 4, wherein the electrode assembly (23) includes two electrode units (231), each of the two electrode units (231) has two sub-end faces (231a) and a sub-tab (231b) extending from each of the two sub-end faces (231a), two of the sub-end (231a) faces on the same side of the two electrode units (231) of the electrode assembly (23) form the end face (23a), and two of the sub-tabs (231b) of the two electrode units (231) of the electrode assembly (23) having same electrode are converged to form the tab (23b), and in the electrode assembly (23), the sub-tab (231b) of one of the two electrode units (231) extends along the axial direction (X) from the region of the sub-end face (231a) adjacent to the other of the two electrode units (231).
- The secondary battery (20) according to claim 5, wherein the tab (23b) extends from the region of the end face (23a) adjacent to the two adjacent wide faces (231c) of the two electrode units (231).
- The secondary battery (20) according to any one of claims 1 to 6, wherein the connecting portion (241) and the tab (23b) are at least partially overlapped in the axial direction (X).
- The secondary battery (20) according to claim 7, wherein the current collecting member (24) further includes a body portion (242) that is connected to the connecting portion (241), and the body portion (242) is at least partially disposed between the electrode assembly (23) and the top cover assembly (22).
- The secondary battery (20) according to claim 7 or 8, wherein the first sheet (241a) has a stripe structure and the thickness direction of the first sheet (241a) is parallel to the first direction (Y).
- The secondary battery (20) according to claim 9, wherein a connection structure is formed by the first sheet (241a) and the tab (23b), and the connection structure does not protrude out of an edge (221a) of the top cover plate (221) in the first direction (Y).
- The secondary battery (20) according to claim 10, wherein the tab (23b) and the current collecting piece (241b) are both located on one side of the first sheet (241a) in the second direction (Z), and the current collecting piece (241b) and the tab (23b) are at least partially overlapped in the axial direction (X).
- The secondary battery (20) according to claim 11, wherein the number of the electrode assemblies (23) is two groups, and the two groups of the electrode assemblies (23) are laminated in the axial direction (X); the number of the current collecting pieces (241b) is two, and the two current collecting pieces (241b) are spaced apart in the axial direction (X) and the two current collecting pieces (241b) are at least partially overlapped in the axial direction (X); the tab (23b) of one group of the electrode assemblies (23) and the tab (23b) of the other group of the electrode assemblies (23) are respectively connected to the two current collecting pieces (241b), and the tab (23b) of the one group of the electrode assemblies (23) and the tab (23b) of the other group of the electrode assemblies (23) are at least partially overlapped in the axial direction (X).
- The secondary battery (20) according to claim 10, wherein the first sheet (241a) and the tab (23b) are at least partially overlapped in the axial direction (X).
- The secondary battery (20) according to claim 13, wherein the number of the electrode assemblies (23) is two groups, and the two groups of the electrode assemblies (23) are laminated in the axial direction (X); the number of the first sheets (241a) and the number of the current collecting pieces (241b) is respectively two, the first sheets (241a) are disposed in one-to-one correspondence with the current collecting pieces (241b), the two first sheets (241a) are spaced apart in the second direction (Z), and the two current collecting pieces (241b) are spaced apart in the axial direction (X) and are spaced apart in the second direction (Z); the tab (23b) of one group of the electrode assemblies (23) and the tab (23b) of the other group of the electrode assemblies (23) are spaced apart in the axial direction (X) and are spaced apart in the second direction (Z), and the two tabs (23b) are respectively connected to the two current collecting pieces (241b).
- The secondary battery (20) according to any one of claims 1-14, wherein the number of the current collecting members (24) is two, and in the first direction (Y), the electrode assembly (23) is disposed between the two current collecting members (24), and the two current collecting members (24) are electrically connected to the corresponding tabs (23b).
- A battery module (10), comprising two or more secondary batteries (20) according to any one of claims 1 to 15, wherein the two or more secondary batteries (20) are arranged side by side in a direction intersecting the axial direction (X).
Applications Claiming Priority (1)
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CN201910058990.7A CN111463367A (en) | 2019-01-22 | 2019-01-22 | Secondary battery and battery module |
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EP3686949A1 EP3686949A1 (en) | 2020-07-29 |
EP3686949B1 true EP3686949B1 (en) | 2021-08-25 |
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US (1) | US11233297B2 (en) |
EP (1) | EP3686949B1 (en) |
CN (1) | CN111463367A (en) |
WO (1) | WO2020151549A1 (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN111384350A (en) * | 2018-12-29 | 2020-07-07 | 宁德时代新能源科技股份有限公司 | Secondary battery and battery module |
CN112864448A (en) * | 2021-03-12 | 2021-05-28 | 湖北亿纬动力有限公司 | Battery monomer, battery cooling system and electric automobile |
CN116544570A (en) * | 2022-01-26 | 2023-08-04 | 宁德时代新能源科技股份有限公司 | Battery monomer, battery and power consumption device |
CN115036648B (en) * | 2022-08-15 | 2022-11-22 | 江苏时代新能源科技有限公司 | Electrode assembly, battery cell, battery and power consumption device |
CN115483488A (en) * | 2022-10-13 | 2022-12-16 | 中创新航科技股份有限公司 | Cylindrical battery |
Family Cites Families (33)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007073317A (en) | 2005-09-07 | 2007-03-22 | Gs Yuasa Corporation:Kk | Winding power generation element and battery |
JP4906538B2 (en) * | 2007-02-28 | 2012-03-28 | 日立ビークルエナジー株式会社 | Lithium secondary battery |
CN201122626Y (en) * | 2007-12-07 | 2008-09-24 | 比亚迪股份有限公司 | Pole piece of stack type battery and pole core and battery including the same |
KR101147237B1 (en) * | 2010-07-12 | 2012-05-18 | 삼성에스디아이 주식회사 | Electrode assembly and rechargeable battery including the same |
KR101233573B1 (en) * | 2011-01-27 | 2013-02-14 | 로베르트 보쉬 게엠베하 | Secondary battery |
CN103594736A (en) * | 2012-08-17 | 2014-02-19 | 迪吉亚节能科技股份有限公司 | Single coiled core, lithium battery with single coiled core and continuous coiling method for single coiled core |
KR20140137180A (en) * | 2013-05-22 | 2014-12-02 | 삼성에스디아이 주식회사 | Rechargeable battery |
KR20150058807A (en) | 2013-11-21 | 2015-05-29 | 삼성에스디아이 주식회사 | Battery pack |
CN103887556B (en) | 2014-03-13 | 2015-08-19 | 深圳格林德能源有限公司 | A kind of power energy storage polymer Li-ion battery and preparation method |
KR102439847B1 (en) | 2015-08-25 | 2022-09-01 | 삼성에스디아이 주식회사 | Rechargeable battery |
JP2017050069A (en) * | 2015-08-31 | 2017-03-09 | 株式会社豊田自動織機 | Power storage device |
CN206250347U (en) | 2016-10-21 | 2017-06-13 | 东莞新能德科技有限公司 | Battery modules |
JP6757499B2 (en) * | 2017-04-07 | 2020-09-23 | トヨタ自動車株式会社 | Rechargeable battery |
CN107214446A (en) | 2017-07-06 | 2017-09-29 | 江西优特汽车技术有限公司 | Battery modules tab welding servicing unit and battery modules pole ear welding method |
CN108428822B (en) | 2017-08-30 | 2023-10-20 | 宁德时代新能源科技股份有限公司 | Top cap subassembly and secondary cell of secondary cell |
CN108198989B (en) * | 2018-01-16 | 2021-01-12 | 宁德时代新能源科技股份有限公司 | Connecting member and rechargeable battery |
CN209217105U (en) * | 2018-12-29 | 2019-08-06 | 宁德时代新能源科技股份有限公司 | Afflux part and secondary cell |
CN209298235U (en) * | 2018-12-29 | 2019-08-23 | 宁德时代新能源科技股份有限公司 | Secondary cell and battery modules |
CN209217103U (en) * | 2018-12-29 | 2019-08-06 | 宁德时代新能源科技股份有限公司 | Secondary cell and battery modules |
CN209217104U (en) * | 2018-12-29 | 2019-08-06 | 宁德时代新能源科技股份有限公司 | Secondary cell and battery modules |
CN111384351A (en) * | 2018-12-29 | 2020-07-07 | 宁德时代新能源科技股份有限公司 | Secondary battery and battery module |
CN111384349A (en) * | 2018-12-29 | 2020-07-07 | 宁德时代新能源科技股份有限公司 | Current collector and secondary battery |
CN111384350A (en) * | 2018-12-29 | 2020-07-07 | 宁德时代新能源科技股份有限公司 | Secondary battery and battery module |
CN111384464A (en) * | 2018-12-29 | 2020-07-07 | 宁德时代新能源科技股份有限公司 | Battery module and battery pack |
CN111384352A (en) * | 2018-12-29 | 2020-07-07 | 宁德时代新能源科技股份有限公司 | Secondary battery and battery module |
CN209217068U (en) * | 2018-12-29 | 2019-08-06 | 宁德时代新能源科技股份有限公司 | Battery modules and battery pack |
CN111384332A (en) * | 2018-12-29 | 2020-07-07 | 宁德时代新能源科技股份有限公司 | Battery module and battery pack |
CN209217029U (en) * | 2018-12-29 | 2019-08-06 | 宁德时代新能源科技股份有限公司 | Secondary cell and battery modules |
CN111384353A (en) * | 2018-12-29 | 2020-07-07 | 宁德时代新能源科技股份有限公司 | Secondary battery and battery module |
CN209232866U (en) * | 2018-12-29 | 2019-08-09 | 宁德时代新能源科技股份有限公司 | Secondary cell and battery modules |
CN209571433U (en) * | 2019-01-22 | 2019-11-01 | 宁德时代新能源科技股份有限公司 | Secondary cell and battery modules |
CN111106301B (en) * | 2019-04-02 | 2021-02-26 | 宁德时代新能源科技股份有限公司 | Secondary battery and battery module |
CN209786120U (en) * | 2019-05-31 | 2019-12-13 | 宁德时代新能源科技股份有限公司 | Secondary battery and battery module |
-
2019
- 2019-01-22 CN CN201910058990.7A patent/CN111463367A/en active Pending
- 2019-06-28 US US16/455,751 patent/US11233297B2/en active Active
- 2019-07-04 EP EP19184413.3A patent/EP3686949B1/en active Active
-
2020
- 2020-01-15 WO PCT/CN2020/072239 patent/WO2020151549A1/en active Application Filing
Non-Patent Citations (1)
Title |
---|
None * |
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US20200235370A1 (en) | 2020-07-23 |
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CN111463367A (en) | 2020-07-28 |
US11233297B2 (en) | 2022-01-25 |
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